Metal sash or window.



11,218,9&

A. W. JOHNSON & W. S. TAIT.

METAL SASH OR WINDOW. APPLICATION FILED FEB. 21, 1914.

Patented J an. 23, 1917.

onnron ALLAN VT. JOI'INSON, OF CHICAGO, AND WILLIAM STUART TAIT, 0F LEMONT, ILLINOIS,

ASSIGNORS Ti) AMERICAN STEEL WINDOW CGMPANY, OF CHICAGO,

CORPORATION OF ILLINOIS.

ILLINOIS, A

METAL SASEI OR WINDOW Application filed February 21, 1914.

To all whom it may concern Be it known that we, ALLAN W. JoI-IN- SON, of Chicago, county of Cook, and State of Illinois, and WILLIAM STUART TAIT, of Lemont, county of Cook, and State of 1111- nois, have invented certain new and useful Improvements in lviietal Sashes or lVindows, of which the following is a specification.

Our invention relates to metallic framework of the kind used in metal sashes or windows, and particularly concerns the in terlocking construction of the joints at the intersection of the mullions or muntin bars of the sash.

The object of the invention is to provide a structure of this kind which shall have a high degree of strength and rigidity, in which the formation and construction of the joints shall resist the strains in every direction to which the intersecting members may be subject and shall secure such intersecting members against displacement and disengagement, which is simple in construction, easy to assemble, and economical to manufacture.

These and incidental objects and advantages we attain by means of our invention, which consists in the particular formation, arrangement and inter-relation of parts of the intersecting muntin bars or frame members, and the essential elements of which are recited in the appended claims.

In the following specification we have described our invention embodied in a practical and preferred form, which is illustrated in the drawings accompanying the specification.

Of such drawings, Figure 1 is a top plan view of the joint formed by two intersecting muntins, the locking tongues, however, being outwardly bent to permit assemblage and not in the closed position which they occupy in the completed structure; Fig. 2 is a perspective of a finished joint; and Figs. 3 and d are side views of the intersecting members.

Like letters of reference refer to the same parts in the several figures.

The cross members, or muntins, of a window sash or other structure in which our invention may be employed, consist of metal cross-bars,preferably, and as illustrated, of T-bars,designated A and B in the drawings, One of these bars, the bar A,

Specification of Letters Patent.

Patented J an. 23, 1911?.

Serial No. 820,174.

which, for convenience in describing and claiming the invention, may be termed the upper muntin or bar, is formed with a cut or opening extending inwardly or upwardly from its base portion, Fig. 3, and the other or lower muntin or bar B is provided with a corresponding cut extending downwardly from the edge of the web portion of the bar, Fig. a, and in the assemblage of the parts the upper bar is lit-ted down over and interlocks tightly with the lower bar. The particular construction of these cuts or notches which form the joint between the two bars. is as follows. The base plate or flange of the bar B is provided at the oppothe bar B, being cut away, leaving the pro jecting ends which fit in the recesses c; and the vertical webs of the two bars A and B are provided with complementary interlocking notchcs,.the notch (Z in the web of the bar B extending downward from its upper edge to about one-half of its depth, and the notch e in the web of the bar A extending upward from its lower edge a corresponding distance, so that when the two bars are fitted together their base flanges will be flush with each other, in the same plane, and the upper surfaces of their webs will like wise be flush with each other.

For the purpose of locking the two bars together at the joint, and to prevent disengagement and displacement vertically,- that is, in a direction normal to their base 1langes,-the bar A is provided with a tongue f, and the bar B with a tongue g, these tongues being cut from the outer part the respective webs in the same horizontal plane, and bent laterally to the positions shown to ermit the assemblage of the two bars. It will be observed that the tongue g is of such length as to extend entirely across the notch (Z in the bar B when straightened out, while the tongue 7, when straightened, extends only to the nearest boundary of intersection of the webs, the web of the bar A, however, being cut away on the same horizontal plane to the opposite boundary. After the bars are fitted together, the tongue 9 is bent back into line with its web, which will cause its inner end to lie in the cut in the outer part of the web of the bar A and overlie the unsevered portion of such bar at the point of crossing of the two webs, thus locking the bars A and B together. The tongue being then bent back into line with its web serves to lock the tongue 9' in line with its own web, and the joint is thereby firmly secured and completed.

It is evident that while the exact construction which has been described is well adapted to the formation of a strong and secure joint, the relative width and other proportions of the parts of the T-bar may vary within considerable limits, and the interlocking of the base flanges even be omitted while retaining the interlocking engagement of the webs. The claims are therefore not intended to be limited beyond their eX- press terms to the specific construction herein described.

We claim:

1. In a metal window sash, a pair of intersecting muntin webs having complementary cross notches, the notched edge of the web of one muntin having a longitudinal tongue extending across the notch and overlying an unsevered portion of the other muntin and such other muntin having a tongue abutting the end of said first-mentioned tongue.

2. In a metal window sash, a pair of intersecting muntin webs having complementary cross notches, the notched edge of the web of one muntin having a longitudinal tongue crossing the top edge of its notch and overlying a portion of the web of the other muntin, and such other muntin having a lon itudinal tongue out in the same plane as said first-mentioned tongue and abutting the end portion of said first-mentioned tongue.

3. In a metal window sash, a pair of intersecting T-shaped muntins formed with complementary cross notches, the outer edge of the web of the lower muntin having a longitudinal tongue overlying an uncut portion of the web or" the upper muntin, and such upper muntin having a longitudinal tongue out in the same plane as said first- .mentioned tongue and abutting the end portion of said first-mentioned tongue.

4;. In a metal window sash, a pair of intersecting T-shaped mullions having their webs formed with complementary cross notches, the flange of the lower muntin be ing recessed and the flange of the upper muntin being cut away to make interlocking engagement in the recess of the lower inuntin, the Web of the lower muntin having a longitudinal tongue overlying an unsevered portion of the web of the upper muntin and the upper muntin having a locking tongue abutting against the end of said first-mentioned tongue.

ALLAN vV. JOHNSON. WILLIAM STUART TAIT.

W'itnesses:

Louis B. ERWIN, Ronnnr DOBBERMAN.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

